<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>学生信息管理</title>
  <style>
    * {
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
  color:#721c24;
}
h1 {
  text-align: center;
  color:#333;
  margin: 20px 0;
 
}
table {
  margin:0 auto;
  width: 800px;
  border-collapse: collapse;
  color:#004085;
}
th {
  padding: 10px;
  background: #cfe5ff;
  
  font-size: 20px;
  font-weight: 400;
}
td,th {
  border:1px solid #b8daff;
}
td {
  padding:10px;
  color:#666;
  text-align: center;
  font-size: 16px;
}
tbody tr {
  background: #fff;
}
tbody tr:hover {
  background: #e1ecf8;
}
.info {
  width: 900px;
  margin: 50px auto;
  text-align: center;
}
.info  input, .info select {
  width: 80px;
  height: 27px;
  outline: none;
  border-radius: 5px;
  border:1px solid #b8daff;
  padding-left: 5px;
  box-sizing: border-box;
  margin-right: 15px;
}
.info button {
  width: 60px;
  height: 27px;
  background-color: #004085;
  outline: none;
  border: 0;
  color: #fff;
  cursor: pointer;
  border-radius: 5px;
}
.info .age {
  width: 50px;
}
  </style>
  <!-- <link rel="stylesheet" href="css/index.css" /> -->
</head>

<body>
  <h1>新增学员</h1>
  <form class="info" autocomplete="off">
    姓名：<input type="text" class="uname" name="uname" />
    年龄：<input type="text" class="age" name="age" />
    性别:
    <select name="gender" class="gender">
      <option value="男">男</option>
      <option value="女">女</option>
    </select>
    薪资：<input type="text" class="salary" name="salary" />
    就业城市：<select name="city" class="city">
      <option value="北京">北京</option>
      <option value="上海">上海</option>
      <option value="广州">广州</option>
      <option value="深圳">深圳</option>
      <option value="曹县">曹县</option>
    </select>
    <button class="add">录入</button>
  </form>

  <h1>就业榜</h1>
  <table>
    <thead>
      <tr>
        <th>学号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>薪资</th>
        <th>就业城市</th>
        <th>操作</th>
      </tr>
    </thead>
    <tbody>
      <!-- 
        <tr>
          <td>1001</td>
          <td>欧阳霸天</td>
          <td>19</td>
          <td>男</td>
          <td>15000</td>
          <td>上海</td>
          <td>
            <a href="javascript:">删除</a>
          </td>
        </tr> 
        -->
    </tbody>
  </table>
  <script>
    // 参考数据
    // const initData = [
    //   {
    //     stuId: 1001,
    //     uname: '欧阳霸天',
    //     age: 19,
    //     gender: '男',
    //     salary: '20000',
    //     city: '上海',
    //   }
    // ]
   const tbody = document.querySelector('tbody')
   const form = document.querySelector('form')
   const items = form.querySelectorAll('[name]')

   const arr =  JSON.parse(localStorage.getItem('student')) || []
           
  //  渲染函数
  function render(data){
    const newArr = data.map((item,index)=>{
        const str = 
        `
        <tr>
        <td>${item.stuId}</td>
        <td>${item.uname}</td>
        <td>${item.age}</td>
        <td>${item.gender}</td>
        <td>${item.salary}</td>
        <td>${item.city}</td>
        <td>
          <a href="javascript:" data-id="${index}">删除</a>
        </td>
      </tr> 
        `
        return str
    })
    tbody.innerHTML = newArr.join('')
  }

render(arr)

// 表单提交
form.addEventListener('submit', (e) =>{
e.preventDefault()
  items.forEach((item) =>{
    if(item.value === ''){
      alert('请输入必填项')
      return
    }
  })

  const obj = {
        stuId: arr[arr.length - 1]?.stuId + 1 || 1,
        uname: items[0].value,
        age:  items[1].value,
        gender:  items[2].value,
        salary:  items[3].value,
        city:  items[4].value,
  }

  arr.push(obj)
  form.reset()
  render(arr)
  localStorage.setItem('student',JSON.stringify(arr))
})


// 删除
tbody.addEventListener('click',(e)=>{
if(e.target.tagName === 'A'){
  const index = e.target.dataset.id
  arr.splice(index,1)
  render(arr)
  localStorage.setItem('student',JSON.stringify(arr))
}
})
  </script>
</body>
</html>